/// Adjust SP by Amount bytes.
void MipsSEInstrInfo::adjustStackPtr(unsigned SP, int64_t Amount,
MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
MipsABIInfo ABI = Subtarget.getABI();
DebugLoc DL;
unsigned ADDiu = ABI.GetPtrAddiuOp();
if (Amount == 0)
return;
if (isInt<16>(Amount)) {
// addi sp, sp, amount
BuildMI(MBB, I, DL, get(ADDiu), SP).addReg(SP).addImm(Amount);
} else {
// For numbers which are not 16bit integers we synthesize Amount inline
// then add or subtract it from sp.
unsigned Opc = ABI.GetPtrAdduOp();
if (Amount < 0) {
Opc = ABI.GetPtrSubuOp();
Amount = -Amount;
}
unsigned Reg = loadImmediate(Amount, MBB, I, DL, nullptr);
BuildMI(MBB, I, DL, get(Opc), SP).addReg(SP).addReg(Reg, RegState::Kill);
}
}
